Minimum Gutter Width

As an example for commercial or industrial installations gutters to have a minimum size of not less than 300 mm wide and 75 mm deep at the high end.

Minimum gutter width.

The gutter width is usually specified by the architect. They can be 4 5 or 6 inches. For domestic installations a minimum size of not less than 200 mm wide and 75 mm deep at the high end commensurate to the roof catchment area serviced by that gutter. Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.

The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well. Gutters come in different sizes. Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size. Deviations from the gradient must be smooth and prevent towards the outlet without a proportional permanent ponding.

The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0 75. Ratio of depth to width of gutter select gutter ratio 0 125x 0 25x 0 375x 0 5x 0 625x 0 75x 0 875x 1x 1 125x 1 25x 1 375x 1 5x 1 625x 1 75x 1 875x 2x calculate drainage reset. The optimum gutter location and fixing trajectory are also explored to produce recommendations. Allowable box gutter width slope and length required by the australian plumbing code as nzs 3500 3 2 box gutters allowable width slope and length to as nzs 3500 3 2018 stormwater drainage acceptable solutions.

Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter. Wp56 the optimum sizing of gutters for domestic roofwater harvesting. Determine gutter width you will need to refer to your plan to determine the width of the box gutter. The architect has specified a gutter width of 450 mm for this roof drainage system.